Twilight Isn't Late, There's a Cat When I Return

Summary

Why did the mysterious former psychiatrist (B) live alone in an old house in the wilderness? Why did an unfamiliar boy (A) and his sick cat come to visit him on a rainy night? Why is the seemingly innocent and harmless boy (A) reluctant to leave him (B)? The more dangerous he (B) seems, the more he's (A) not willing to leave him (B). —A long time ago, he (B) lit a candle in the darkness of my night. Now this time, it's my (A) turn to change his (B) world.